| BLS (UK Holdings) Limited | Newbury | 2020 |
| BLS (UK) Limited | Newbury | 2000 |
| BLS Corporation Limited | Wigan | 2025 |
| BLS Group NW Ltd | Lancaster | 2021 |
| BLS Investing Limited | Elstree | 2021 |
| BLS Investments Limited | Belfast | 2019 |
| BLS Management Services Limited | Kilmarnock | 2018 |
| BLS Ventures Limited | Elstree | 2021 |
| BLS84 Consulting Ltd | Basildon | 2023 |
| Blsg COE Limited | King'S Lynn | 2018 |
| Bltb Limited | Sutton Coldfield | 2026 |
| Bltt Bidco Limited | London | 2025 |
| Blttho Ltd | Tyne & Wear | 2026 |
| BLU Banana Properties Ltd | Glasgow | 2018 |
| BLU Bryn Ltd | Crewe | 2025 |
| BLU Chip Limited | Manchester | 2020 |
| BLU Cielo Ltd | London | 2024 |
| BLU Docks Limited | London | 2003 |
| BLU Dog Holding Ltd | London | 2022 |
| BLU Family Office Limited | Richmond | 2015 |
| BLU Finance Group Limited | Festival Park | 2003 |
| BLU Financial Ltd | Coventry | 2021 |
| BLU Heartknot UK, Ltd | London | 2025 |
| BLU Niche Risk Services Limited | London | 2021 |
| BLU Nova Trading Ltd | Coalville | 2025 |
| BLU One Capital Ltd | Dukinfield | 2026 |
| BLU Pack Group Limited | Bury St. Edmunds | 2024 |
| BLU Sky Holdings Ltd | Rochdale | 2025 |
| BLU UK Holdings Limited | Leeds | 2023 |
| BLU Ventures Limited | Berkeley | 2020 |
| BLU Wireless Technology (EBT) Limited | Bristol | 2017 |
| BLU3 (Holdings) Limited | Chatham | 2005 |
| BLU3 Group Holdings Limited | Chatham | 2025 |
| Blubird Investments Ltd | Chatham | 2025 |
| Blucrest Capital Ltd | London | 2025 |
| Bludome Limited | London | 2026 |
| Blue 206 Limited | Dundee | 2020 |
| Blue Adair Ltd | Ruislip | 2021 |
| Blue Anchor Analytics Limited | Bristol | 2026 |
| Blue and Gold Holdings Limited | Holt | 2016 |
| Blue and Gold Investments Ltd | Cambridge | 2025 |
| Blue and White Loans Ltd | Hatch End | 2015 |
| Blue and White UK Holdings | Chester | 2020 |
| Blue and Yellow Investments Limited | Lewes | 2025 |
| Blue Apple Catering Holdings Limited | Rubery | 2014 |
| Blue Apple Education Group Ltd | Kington | 2026 |
| Blue Arch Holdings Ltd | Leicester | 2020 |
| Blue Arrow Financial Services Limited | London | 2002 |
| Blue Arrow Properties Limited | Tonbridge | 1962 |
| Blue Arrow Property Investment Ltd | Bexleyheath | 2023 |
| Blue Arrow Traffic Management (Holdings) Limited | Runcorn | 2015 |
| Blue Atlas Wealth Limited | Middlesex | 2013 |
| Blue Auto Finance Limited | Sevenoaks | 2014 |
| Blue Auto Holdings Limited | Sundridge | 2014 |
| Blue Badge Mobility Insurance Broker Services Limited | Havant | 2014 |
| Blue Badger Financial Limited | Chelmsford | 2017 |
| Blue Balloon Invest Ltd | Okehampton | 2018 |
| Blue Bard Holdings Ltd | Ipswich | 2026 |
| Blue Barn Group Limited | Stokesley | 2021 |
| Blue Barn Holdings Limited | Otley | 2020 |
| Blue Barrels Global Limited | Southend-On-Sea | 2017 |
| Blue Bay (South West) Holdings Limited | Bideford | 2022 |
| Blue Bay Holdings Limited | London | 2018 |
| Blue Bay Home Care Group Limited | Edgware | 2024 |
| Blue Bear Capital (Services) Limited | London | 2026 |
| Blue Bear Holding Limited | Blackpool | 2016 |
| Blue Bear Ventures Ltd | Corwen | 2012 |
| Blue Bell Holdings Limited | Milton Keynes | 2018 |
| Blue Berg Ltd | London | 2020 |
| Blue Bidco Limited | Reading | 2018 |
| Blue Book Holdings Limited | Bromsgrove | 2025 |
| Blue Border EOT Limited | Nelson | 2023 |
| Blue Bowl Investments Limited | Belfast | 2012 |
| Blue Box Inc Limited | London | 2022 |
| Blue Bridge Assets Ltd | London | 2025 |
| Blue Bridge Wealth Structuring Limited | Prenton | 2014 |
| Blue Business Capital Ltd | Hemel Hempstead | 2025 |
| Blue Button Legal Indemnities Ltd | Ipswich | 2016 |
| Blue Cactus Holdings Limited | London | 2020 |
| Blue Capital Income Limited | Longfield | 2024 |
| Blue Capital Limited | Bolton | 2012 |
| Blue Carbon Restoration Company Limited | London | 2022 |
| Blue Cat Holdings Limited | Camberley | 2018 |
| Blue Cat Trading Firm Ltd | Wembley | 2026 |
| Blue Catalyst Fund Limited | London | 2025 |
| Blue Cedar Capital Limited | London | 2012 |
| Blue Charm Ventures Ltd | Pershore | 2025 |
| Blue Chestnut Holdings Ltd | Birmingham | 2023 |
| Blue Chip Business Services Ltd | West Tytherley | 1995 |
| Blue Chip Capital Ltd | Chalfont St Peter | 2019 |
| Blue Chip Group Holdings Ltd | Glasgow | 2023 |
| Blue Cinemas Limited | London | 2025 |
| Blue Circle Corporation Ltd | Benfleet | 2026 |
| Blue Circle Holdings Limited | Knowsley | 2017 |
| Blue Circle Wealth Management Ltd | Glasgow | 2010 |
| Blue Cloud Global U.K. Limited | Hastings | 2023 |
| Blue Clover Limited | Bowness On Windermere | 2001 |
| Blue Coast (Euro) Limited | London | 2013 |
| Blue Coast Capital Limited | London | 2019 |
| Blue Coast Holding Limited | Ashton-Under-Lyne, Greater Manchester | 2022 |